| The durability of reinforced concrete (RC) structures is one of the problems which are widely concerned in the area of civil engineering. Among numerous factors, the corrosion of reinforcements the dominating factor to the durability problem, because it has a significant impact on the bond performance of reinforced concrete.Based on the achievement of previous studies, the experiment study of the bond issue of corroded RC was studied in this paper. In particular, the regularity of bond deterioration occurred in the corroded RC subjected to cyclic loads was deeply researched and explored. For this reason, this paper has certain theoretical meaning and engineering value. The main works are as follows:(1) According to the pullout tests of the corroded steel, the bond behavior of deformed bars with different corrosion ratio is discussed in the paper. The formula of bond intensity which considers the influence of the rust-degree is got by fitting the test data. After getting the average bond stress-slip relation, the constitutive relation of bond-slip between the rusted steel bar and concrete is established, which can be used to the finite element analysis.(2) Otherwise, the pullout test is emulated through the finite element analysis. The stress and strain of the corroded bar and concrete,the slip at the both side of the corroded bar and the bond stress between the corroded bar and the concrete which are acted on different kinds of load is got by using the commercial software ANSYS. By comparing the test results with the calculated results, the availability of the calculated results is proved.(3) By studying the bond performance between the longitudinal reinforcement and the concrete of corroded RC members under cyclic loads, the stress distribution of longitudinal reinforcement is achieved and the varied laws of bond-slip under different corrosion rate was obtained. |
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